20v head in 4ac block??? its posible?

Itsuki Joined: 21 May 2008 Posts: 19

hello, im beto from argentina, i´ve got the only ae86 in my country, is a sr5. (1984)

I want to know if it posible to put into the 4ac block, a 20v head, with pistons of 20v, with my crank and conecting rods (4ac)
Its posible??

i wish to buy a 4age20v complete, but here its imposible, this engine doesnt exist.

thanks, and sorry for my english,

beto

Posted: Thu Jan 15, 2009 10:31 pm Post subject:

Well, both engines are A series, so the head fits... I know 16v heads have been put on 20v bottoms, however I wouldn't put a 20v on a non 20v bottom: the 20v has some differences in holes for oil transportation so you would be blocking a few of them...

You can see the differences on the head gaskets:
AE86 : Projects > 20v head in 4ac block its posible

AE86 : Projects > 20v head in 4ac block its posible

top one is 20v and bottom one is 16v.

But that's only my opinion from a theoretical point of view...

Itsuki Joined: 21 May 2008 Posts: 19

thanks for the info!

yeah, but if i change the gasket and put a 20v gasket?

i think if in the age 16v you can put a 20v head, in my sr5 too. I saw in forums a 4ac with a 16v head and fits ok

i found a picture of one 20v block, and i compare with my 4ac block, looks the same!!

wat you think?¿ im crazy? jeje

every hole are in the same place

AE86 : Projects > 20v head in 4ac block its posible

Posted: Fri Jan 16, 2009 1:19 am Post subject:

Interesting project!
But is the block of the 4ac good to keep with safety the power of 20v?

Itsuki Joined: 21 May 2008 Posts: 19

jaja thanks, i want to use my ae86 only the weekends, no for racing in a circuit, i want to acelerate sometimes, supouse 1, 2 3 gear, i dont know, i think this can be done!!

well, first i must buy the head, this is a problem too jaja, in argentina my ae86 is the only! je, im crazy, but ive got FE

well, wen the project stars i must upload the process

thanks, and sorry again for my english

few pictures of my sr5:

AE86 : Projects > 20v head in 4ac block its posible

Posted: Fri Jan 16, 2009 4:38 am Post subject:

Toymods has a number of threads about putting a 20v head on an older block. The 4ac and 4age blocks are identical apart from number of support ribs and oil squirters, neither of which will affect what you're trying to do.

Chris

Posted: Fri Jan 16, 2009 4:29 pm Post subject:

Wow! Amazing amount of rust! I almost dare not to ask about the state of the floorpan! Embarassed

To answer your question: yes most holes are there and some of the 20v holes are wider. It would work of course, but don't expect wonders from the engine.

Itsuki Joined: 21 May 2008 Posts: 19

thanks for the info guys, and yes, the car is bad condition, but is the only in my country jjajaja, was this sr5 or nothing jajaj

now i made a complete overhaling , in a few months he come back from the deads! with panda colors!

Posted: Sat Jan 17, 2009 4:05 pm Post subject:

keep in mind 4ac's have a weaker crank. and have only 6 bolt flywheels, instead on 8.

dont rev it tooo hard

Posted: Sat Jan 17, 2009 4:50 pm Post subject:

Dont do it mate. t crank design is not the same, its weaker, same as rods and pistons.

Itsuki Joined: 21 May 2008 Posts: 19

thanks, yes i know about de crank and rods, i have to change pistons only, but, for a daily use must work, i hope

well i keep you in touch

beto

Posted: Tue Jan 20, 2009 12:19 am Post subject:

Wow Beto, esto es un gran proyecto en el que te metes.

Hopefully this will come out pretty good and you'll make it work, but listen to what this guys are telling you: don't rev it too hard and don't expect wonders from the engine... those 2 phrases let me thinking...

good luck anyway! Buena suerte!

Thumbsup

Itsuki Joined: 21 May 2008 Posts: 19

gracias pedro! si, el tema es q aca es el unico q hay, no hay ni un solo ae86, ni motor 4age 16 ni 20v, soy el unico loco aqui, peor bueno, gracias a un par de chicos del foro del ae86 del peru voy consiguiendo cosas, yo a esto del 20v le tengo fe! aca arman fiats uno para 1/4 de milla y nadie le cambia el cigueñal, asi q por eso creo q puede llegar a andar, ademas, yo no le voy a estar dando todo el dia, es solo para pasear y de vez en cuando acelerar un poco, no mas que eso!

muy bueno el tuyo!! un 10 al buen gusto! esas llantas son buenisimas!

a pedro, ya q estoy te pregunto, donde compraste los corners y la tapita de la luz cuando esta cerrada? esta muy buena! yo las mias las tengo q pintar de negro nomas, pero bue

saludos

Posted: Tue Jan 20, 2009 12:59 am Post subject:

Hi Beto!!!

I think that you must listening the other boys, i think is a crazy idea.

Hola Beto, la verdad que los dos somos unos auténticos locos, tú eres el único dueño de hachi en Argentina y yo casi lo mismo en España en la península pues en las islas Canarias si hay muchos.

Un saludo y un placer

jcsantosser@gmail.com

Itsuki Joined: 21 May 2008 Posts: 19

jajaja si estamos todos locos! lo peor de todo es q yo me enamore del auto por jugar en el gran turismo, ni sabia q existia inital d ni el rey del drift ni nada, fue amor a primera vista jajaja, saludosleckter!! y arriba esos hachis!
hachi roku rules!!

Posted: Tue Jan 20, 2009 10:30 pm Post subject:

Itsuki Joined: 21 May 2008 Posts: 19

hello guys, i have another answer:

the crank of 4ac has 40mm? or 42mm?

the pistons of the 20v has pins of 18mm or 20mm?

the 4ac pistons has pins of 18mm or 20mm?

thanks!

Posted: Fri Jan 23, 2009 4:50 am Post subject:

4ac->40mm crank,
20c->42mm crank
4ac->18mm pins,
20v->20mmpins

Itsuki Joined: 21 May 2008 Posts: 19

thanks walaki!

another question:

if i make a forged piston here (argentina) and the top of the piston are plane, (no with the mark of the 5 valves) its still work? or de valves crash with the piston?

tahnks!

Itsuki Joined: 21 May 2008 Posts: 19

well, i have news!

i buy a 4age red top head!!!

i want to put this head in my 4a (c) block, i read that the 4a block its the same for all , its the same of the first generation of 4age blue top, with conrods and crank (40), but the crank has six bolts only.

well, for now i only put de head in the block, and it fits perfect, in a few weeks i star the project, and i promise photos of this "swap" jajaja

sorry for my english!

AE86 : Projects > 20v head in 4ac block its posible

4ac block with red top

Posted: Wed Apr 22, 2009 8:01 am Post subject: Good luck

Wow that is one insane project, I've seen it done before so it must work. Are you changing the crank too? Or just the pistons?

Checkout my SR5 to GT-S project.....
http://project-ae86.blogspot.com/

Right now I'm still posting stuff but keep an eye on it you might learn as I learn LOL!